Doesn't work on new files

[3hhh]

The plugin doesn't apply indention settings to new files (check e.g. vim foo).

As I see it, there's two ways to fix that:

1. Add BufNewFile to the existing BufReadPost autocmd in https://github.com/Raimondi/yaifa/blob/master/plugin/yaifa.vim#L39
2. Keep the default vimrc indention settings/do nothing whenever indention settings cannot be identified for a file. Essentially this would allow you to remove most of the existing yaifa settings and save a bit of performance & code.

Personally I like option 2 more, but maybe I overlooked something.

Side Note: https://github.com/Raimondi/yaifa/blob/master/doc/yaifa.txt#L124 is not about yaifa_disabled.

Other than that thanks a lot for this nice plugin! Keep on hacking! :-)